129 lines
5.0 KiB
C++
129 lines
5.0 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/.
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*/
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#include "TextDrawable.hpp"
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#include "Scene/Geometry.hpp"
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#include "Scene/Material.hpp"
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#include "Scene/Vertex.hpp"
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#include "Scene/UniformBuffer.hpp"
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#include "Scene/FontAtlasGenerator.hpp"
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#include "Base/Logger.hpp"
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#include <utf8.h>
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namespace OpenVulkano::Scene
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{
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using namespace msdfgen;
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using namespace msdf_atlas;
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Shader& TextDrawable::GetDefaultShader()
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{
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static bool once = true;
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static Shader textDefaultShader;
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if (once)
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{
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textDefaultShader.AddShaderProgram(OpenVulkano::ShaderProgramType::VERTEX, "Shader/text");
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textDefaultShader.AddShaderProgram(OpenVulkano::ShaderProgramType::FRAGMENT, "Shader/text");
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textDefaultShader.AddVertexInputDescription(OpenVulkano::Vertex::GetVertexInputDescription());
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textDefaultShader.AddDescriptorSetLayoutBinding(Texture::DESCRIPTOR_SET_LAYOUT_BINDING);
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textDefaultShader.AddDescriptorSetLayoutBinding(UniformBuffer::DESCRIPTOR_SET_LAYOUT_BINDING);
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textDefaultShader.alphaBlend = true;
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textDefaultShader.cullMode = CullMode::NONE;
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once = false;
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}
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return textDefaultShader;
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}
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TextDrawable::TextDrawable(FontAtlasGenerator* fontAtlasGenerator, const TextConfig& config)
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{
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if (!fontAtlasGenerator) { throw std::runtime_error("FontAtlasGenerator is nullptr"); }
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if (fontAtlasGenerator->GetAtlasInfo().empty()) { throw std::runtime_error("Glyphs are not loaded"); }
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m_fontAtlasGenerator = fontAtlasGenerator;
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m_cfg = config;
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m_material.texture = const_cast<Texture*>(&m_fontAtlasGenerator->GetAtlas());
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m_uniBuffer.Init(sizeof(TextConfig), &m_cfg, 3);
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}
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void TextDrawable::GenerateText(const std::string& text, const Math::Vector3f& pos)
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{
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if (text.empty())
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{
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return;
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}
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std::map<unicode_t, GlyphInfo>& symbols = m_fontAtlasGenerator->GetAtlasInfo();
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m_geometry.Close();
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m_geometry.Init(text.size() * 4, text.size() * 6);
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const Texture& atlasTex = *m_material.texture;
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struct Bbox
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{
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double l = 0, r = 0, t = 0, b = 0;
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};
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double cursorX = pos.x;
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auto begin = text.begin();
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auto end = text.end();
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for (size_t i = 0; begin != end; i++)
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{
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unicode_t c = utf8::next(begin, end);
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if (symbols.find(c) != symbols.end())
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{
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Bbox glyphBaselineBbox, glyphAtlasBbox;
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uint32_t vIdx = i * 4;
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uint32_t indices[] = { 1 + vIdx, 2 + vIdx, 3 + vIdx, 1 + vIdx, 3 + vIdx, 0 + vIdx };
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GlyphInfo& info = symbols.at(c);
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info.geometry.getQuadPlaneBounds(glyphBaselineBbox.l, glyphBaselineBbox.b, glyphBaselineBbox.r,
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glyphBaselineBbox.t);
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info.geometry.getQuadAtlasBounds(glyphAtlasBbox.l, glyphAtlasBbox.b, glyphAtlasBbox.r,
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glyphAtlasBbox.t);
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double bearingX = info.glyphBox.bounds.l;
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double bearingY = info.glyphBox.bounds.t;
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double w = glyphBaselineBbox.r - glyphBaselineBbox.l;
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double h = glyphBaselineBbox.t - glyphBaselineBbox.b;
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double l = glyphAtlasBbox.l;
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double r = glyphAtlasBbox.r;
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double t = glyphAtlasBbox.t;
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double b = glyphAtlasBbox.b;
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double ax = cursorX + bearingX;
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double ay = pos.y - (h - bearingY);
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m_geometry.vertices[vIdx].position.x = ax;
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m_geometry.vertices[vIdx].position.y = ay;
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m_geometry.vertices[vIdx].position.z = 1;
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m_geometry.vertices[vIdx].textureCoordinates.x = l / atlasTex.resolution.x;
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m_geometry.vertices[vIdx].textureCoordinates.y = b / atlasTex.resolution.y;
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m_geometry.vertices[vIdx + 1].position.x = ax + w;
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m_geometry.vertices[vIdx + 1].position.y = ay;
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m_geometry.vertices[vIdx + 1].position.z = 1;
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m_geometry.vertices[vIdx + 1].textureCoordinates.x = r / atlasTex.resolution.x;
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m_geometry.vertices[vIdx + 1].textureCoordinates.y = b / atlasTex.resolution.y;
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m_geometry.vertices[vIdx + 2].position.x = ax + w;
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m_geometry.vertices[vIdx + 2].position.y = ay + h;
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m_geometry.vertices[vIdx + 2].position.z = 1;
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m_geometry.vertices[vIdx + 2].textureCoordinates.x = r / atlasTex.resolution.x;
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m_geometry.vertices[vIdx + 2].textureCoordinates.y = t / atlasTex.resolution.y;
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m_geometry.vertices[vIdx + 3].position.x = ax;
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m_geometry.vertices[vIdx + 3].position.y = ay + h;
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m_geometry.vertices[vIdx + 3].position.z = 1;
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m_geometry.vertices[vIdx + 3].textureCoordinates.x = l / atlasTex.resolution.x;
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m_geometry.vertices[vIdx + 3].textureCoordinates.y = t / atlasTex.resolution.y;
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m_geometry.SetIndices(indices, 6, 6 * i);
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// TODO: change to lower value(or ideally remove completely) to avoid overlapping and make less space between symbols
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// when setting for depth comparison operator will be available( <= )
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cursorX += info.glyphBox.advance + 0.08;
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}
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else
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{
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// throw ? replace with ? character (if available) ?
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Logger::RENDER->error("Could not find glyph for character {}", c);
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}
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}
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SimpleDrawable::Init(m_shader, &m_geometry, &m_material, &m_uniBuffer);
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}
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} |